S Canis Minoris

S Canis Minoris

The visual band light curve of S Canis Minoris, from AAVSO data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Minor
Right ascension 07h 32m 43.06942s[2]
Declination 08° 19′ 05.1975″[3]
Apparent magnitude (V) 6.5 to 13.7[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M7-8e[6]
B−V color index 1.50±0.51[7]
Variable type Mira variable[8][4]
Astrometry
Radial velocity (Rv)68.0±4.8[9] km/s
Proper motion (μ) RA: −10.785[2] mas/yr
Dec.: −12.827[2] mas/yr
Parallax (π)2.3934 ± 0.0982 mas[2]
Distance1,532 ly
(470 pc)[5]
Details
Radius300[5][a] R☉
Luminosity5,000[5] L☉
Surface gravity (log g)−0.55[10] cgs
Temperature2,800[5] K
Metallicity [Fe/H]+0.39[10] dex
Other designations
S CMi, BD+08°1800, HD 59950, HIP 36675, SAO 115591[11]
Database references
SIMBADdata

S Canis Minoris is a variable star in the equatorial constellation Canis Minor. It has a peak apparent visual magnitude of 6.5, so not normally visible to the naked eye. The star is located at a distance of approximately 1,530 light-years from the Sun based on stellar parallax, and is drifting further away with a radial velocity of about +68 km/s.

This is an aging red giant star with a stellar classification of M7-8e,[6] where the 'e' suffix indicates emission lines in the spectrum. It is a Mira-type[8] long period variable that varies by an amplitude of 4.27 in visual magnitude over a period of 327.77±2.78 d.[12] Evidence has been found of asymmetry in this star, suggesting a non-spherical shape.[5] Abundance-wise, it is an oxygen-rich[13] giant and the emission feature is of the oxygen-rich silicate class as it sheds silicate dust from its atmosphere.[14] The star is shedding mass at the rate of 4.9×10−8 M☉·yr−1.[5]

  1. ^ Cite error: The named reference aavso was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference dr3 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference Danilovich2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference keenan1974 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference garfinkle1997 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference starhorse2 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Vogt2016 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Winters2003 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Sloan1998 was invoked but never defined (see the help page).


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